How can I implement a relay state that defines a specific locale?
Answer
A relay state is basically just a token to select a redirect target after successful authentication (i.e., after the SAML/consume URL is called).
The name of the relay state is arbitrary and can be anything (it should contain only letters, no whitespaces).
If a relay state is not found or none is declared, it uses the default target which is:
/app/modules/?triggerLogin=true&username=USERNAME&partition=PARTITION
So you could set up states like:
localeDE : /app/?locale=de&uiLanguage=de